Added cplat branch and exclude it in code verification (Azure#20637)

* Added cplat branch and exclude it in code verification

* Remove Steve from mgmt code owner

Author: allenjzhang

.github/CODEOWNERS

@@ -599,8 +599,8 @@ sdk/trafficmanager/Microsoft.Azure.Management.TrafficManager/            @tmsupp
 
 # ######## Management Plane ########
 
-/**/*Management*/                               @allenjzhang @m-nash @markcowl @YalinLi0312 @bquantump @nisha-bhatia
-/**/Azure.ResourceManager*/                     @allenjzhang @m-nash @markcowl @YalinLi0312 @bquantump @nisha-bhatia
+/**/*Management*/                               @allenjzhang @m-nash @markcowl @YalinLi0312 @nisha-bhatia
+/**/Azure.ResourceManager*/                     @allenjzhang @m-nash @markcowl @YalinLi0312 @nisha-bhatia
 
 # Reviewers to double check any API changes
 /sdk/**/api/                                    @KrzysztofCwalina @tg-msft

eng/pipelines/mgmt.yml

@@ -4,6 +4,7 @@ pr:
     include:
     - master
     - '*-preview'
+    - 'feature/cplat*'
   paths:
     include:
     - Directory.Build.props

eng/pipelines/templates/jobs/ci.mgmt.yml

@@ -12,7 +12,7 @@ jobs:
         displayName: "Build & Package"
       - task: PowerShell@2
         displayName: "Verify generated code"
-        condition: and(succeeded(), ne(variables['System.TeamProject'],'internal'))
+        condition: and(succeeded(), ne(variables['System.TeamProject'],'internal'), not(contains(variables['System.PullRequest.TargetBranch'], 'feature/cplat')))
         inputs:
           filePath: "eng/scripts/Track1CodeCheck.ps1"
           pwsh: true